All
Here is my $.02. First smell the motor. If the motor has burnt windings you can smell them. mesureesure the resistance between the winding. If the resistance beteen the winding is roughly the same suspect the capastor in the control box. If something mechanical has failed a visually inspection will reveal it. There a lot of parts in there but is faitly intutive on how to assemble them.
good luck
nickly
-------------- Original message from Roy rdwelch@swbell.net: --------------
Hi Guys,
My two cents worth. It looks like Sebastian has made all of the checks. I assume the rotor will not move in either direction. It's possible that something had fallen into the gear train, jamming the works but it does sound more like a bad motor. Have you measured all of the voltages and especially the resistance values on the motor leads as shown in the owner's manual? If the resistances all look good and the supply voltages are good then I would check the resistance from each motor lead to the metal case to see if there is a short circuit to the rotor housing. I'm not sure but in some countries RFI hash protection has been added to the rotor circuitry consisting of small RF chokes and capacitors mounted inside the rotor case. For example, my Emoto rotors don't have it but the versions sold in some European countries do have it. You might check to see if there is a similar thing in your rotor and that there are no failures there. I doubt that this is the problem however. Good luck.
Roy -- W0SL
Sangat Singh wrote:
Sebastian,
I had a similar problem. In my case I found that the 24 volt motor had packed up. Since I had another Elevation Rotator with the faulty pot sitting on my bench for half a century, I swapped the motor and it worked. The motor is easily removed. Please remove the 4 screws that hold the motor and then try powering up and see if the motor works. I suppose you won't have a spare motor. I am trying to get the faulty motor rewired. Our local talent can do wonderful things.
You might consult Roy Welch who has a great knowledge on ailing Yaesu rotators. I am sure he has seen this mail and may have some valuable suggestions. Do share your experience if you manage to fix this problem.
Opening nuts is a big problem and your Motor Cycle workshop should be able to help. I got mine too opened that way.
73
Sangat, 9M2SS
2008/9/27 Sebastian >
Well I had been back on the birds for the last 3 months or so, and while I was getting ready for an AO-16 pass a few days ago, my elevation rotor on my Yaesu G-5400B stopped at about 10 degrees. That's it. It won't go back down or up. So I checked the wiring on the rotor, everything appeared fine. I removed the elevation rotor from the azimuthal, and took it inside. I made a small patch cord to go from the control box to the rotor, but no luck. All I get is the display of the elevation of about 10 degrees, and I hear a little hum when I attempt to move it up or down. This tells me that the potentiometer is probably good, and the motor is receiving power. I've removed the small nameplate on the side, and there is no water inside, and I can see the ball bears; there doesn't appear to be any rust inside. I also removed the terminal assembly in case one of the wire had come loose, or had a cold solder joint, but I didn't find any problems there. Looking at the diagram of the rotor, there appears to only be a small 24 volt motor which turns this; along with numerous mechanical parts. So the question is. Before I send this to Yaesu, has anyone had this problem before, is it a minor one (something that I could fix myself), or is best left to Yaesu? Before anyone mentions, Norm's no longer services these rotors. The four 'screws' that hold the two parts are impossible for me to loosen. I would have to use a vice, but I do have a friend with a motorcycle repair business who I'm sure could open it for me in 60 seconds. To me, this looks like a jigsaw puzzle by looking at the diagram. The rotor was in service for about a couple of years back in the early 90s. It then sat inside without any use, up until a few months ago. If the consensus is to send it to Yaesu, should I bother to send in the azimuthal rotor, or should I follow the "don't fix it if it aint broken" rule? _______________________________________________ Sent via AMSAT-BB@amsat.org . Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb-- Sangat Singh 53, Jln. Perdana National Planetarium 50480 Kuala Lumpur (MALAYSIA) Mobile: +60122838873 Office: +60322787388 FAX: +60322738873 Skype ID: sukhija
-- Roy
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb